diff --git a/.rspec b/.rspec
index 6adb798c..9c3c126f 100644
--- a/.rspec
+++ b/.rspec
@@ -1,3 +1,2 @@
 --color
---backtrace
 #--fail-fast
diff --git a/Gemfile b/Gemfile
index 12e20c8f..ab9b05fd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,6 +5,9 @@ gemspec
 # For Veritas::Immutable, will be extracted soon
 gem 'veritas', :git => 'https://github.com/dkubb/veritas'
 
+# Until there is a release with explicit sends to self fix
+gem 'to_source', :git => 'https://github.com/mbj/to_source'
+
 group :development do
   gem 'rake',    '~> 0.9.2'
   gem 'yard',    '~> 0.8.1'
diff --git a/lib/mutant.rb b/lib/mutant.rb
index 8a8362b3..4eda272f 100644
--- a/lib/mutant.rb
+++ b/lib/mutant.rb
@@ -24,6 +24,7 @@ end
 require 'mutant/support/abstract'
 require 'mutant/random'
 require 'mutant/mutator'
+require 'mutant/mutator/registry'
 require 'mutant/mutator/literal'
 require 'mutant/mutator/literal/boolean'
 require 'mutant/mutator/literal/range'
@@ -38,9 +39,10 @@ require 'mutant/mutator/literal/regex'
 #require 'mutant/mutator/literal/dynamic'
 require 'mutant/mutator/block'
 require 'mutant/mutator/self'
-require 'mutant/mutator/send'
-require 'mutant/mutator/send_with_arguments'
-require 'mutant/loader'
+require 'mutant/mutator/call'
+require 'mutant/mutator/call/send'
+require 'mutant/mutator/call/send_with_arguments'
+require 'mutant/loader' 
 require 'mutant/context'
 require 'mutant/context/constant'
 require 'mutant/mutatee'
diff --git a/lib/mutant/mutator.rb b/lib/mutant/mutator.rb
index 214b096a..86e0673e 100644
--- a/lib/mutant/mutator.rb
+++ b/lib/mutant/mutator.rb
@@ -15,29 +15,11 @@ module Mutant
     #
     def self.each(node, &block)
       return to_enum(__method__, node) unless block_given?
-      mutator(node).new(node, block)
+      Registry.lookup(node.class).new(node, block)
 
       self
     end
 
-    # Return mutator for node or raise
-    #
-    # @param [Rubinius::AST::Node] node
-    #
-    # @return [Mutator]
-    #
-    # @raise [NameError]
-    #   raises NameError if mutator for node cannot be found
-    #
-    # @api private
-    #
-    def self.mutator(node)
-      Mutator.map.fetch(node.class) do
-        raise ArgumentError,"No mutator to handle: #{node.inspect}"
-      end
-    end
-    private_class_method :mutator
-
     # Register node class handler
     #
     # @param [Class:Rubinius::AST::Node] node_class
@@ -47,20 +29,10 @@ module Mutant
     # @api private
     #
     def self.handle(node_class)
-      Mutator.map[node_class]=self
+      Registry.register(node_class,self)
     end
     private_class_method :handle
 
-    # Return map of rubinus AST nodes to mutators
-    #
-    # @return [Hash]
-    #
-    # @api private
-    #
-    def self.map
-      @map ||= {}
-    end
-
   private
 
     # Initialize generator
@@ -291,7 +263,6 @@ module Mutant
       emit_safe(new_nil)
     end
 
-
     # Return AST representing send
     #
     # @param [Rubinius::AST::Node] receiver
@@ -306,6 +277,16 @@ module Mutant
       new(Rubinius::AST::SendWithArguments, receiver, name, arguments)
     end
 
+    # Return duplicated (unfrozen) node each call
+    #
+    # @return [Rubinius::AST::Node]
+    #
+    # @api private
+    #
+    def dup_node
+      node.dup
+    end
+
     memoize :sexp
   end
 end
diff --git a/lib/mutant/mutator/call.rb b/lib/mutant/mutator/call.rb
new file mode 100644
index 00000000..3e41ea71
--- /dev/null
+++ b/lib/mutant/mutator/call.rb
@@ -0,0 +1,42 @@
+module Mutant
+  class Mutator
+    # Abstract class for mutatiosn where messages are send
+    class Call < Mutator
+
+      private
+
+
+      # Return receiver AST node
+      #
+      # @return [Rubinius::AST::Node]
+      #
+      # @api private
+      #
+      def receiver
+        node.receiver
+      end
+
+      # Return name of call
+      #
+      # @return [Symbol]
+      #
+      # @api private
+      #
+      def name
+        node.name
+      end
+
+      # Check if receiver is self
+      #
+      # @return [true]
+      #   returns true when receiver is a Rubinius::AST::Self node
+      #
+      # @return [false]
+      #   return false otherwise
+      #
+      def self?
+        receiver.kind_of?(Rubinius::AST::Self)
+      end
+    end
+  end
+end
diff --git a/lib/mutant/mutator/call/send.rb b/lib/mutant/mutator/call/send.rb
new file mode 100644
index 00000000..64f69eae
--- /dev/null
+++ b/lib/mutant/mutator/call/send.rb
@@ -0,0 +1,34 @@
+module Mutant
+  class Mutator
+    class Call < Mutator
+      # Mutator for Rubinius::AST::Send
+      class Send < Call
+
+        handle(Rubinius::AST::Send)
+
+      private
+
+        # Emit mutations
+        #
+        # @return [undefined]
+        #
+        # @api private
+        #
+        def dispatch
+          emit_explicit_receiver
+        end
+
+        # Emit a private vcall mutation
+        #
+        # Transforms a call on self with implict receiver into one with 
+        # explcit receiver.
+        #
+        #   foo(1) => self.foo(1)
+        #
+        def emit_explicit_receiver
+          emit_self(receiver,name,false,true)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/mutant/mutator/call/send_with_arguments.rb b/lib/mutant/mutator/call/send_with_arguments.rb
new file mode 100644
index 00000000..ceeb2fcf
--- /dev/null
+++ b/lib/mutant/mutator/call/send_with_arguments.rb
@@ -0,0 +1,25 @@
+module Mutant
+  class Mutator
+    # Mutator for Rubinius::AST::Send
+    class Call < Mutator
+      class SendWithArguments < Call
+
+        handle(Rubinius::AST::SendWithArguments)
+
+      private
+
+        # Emit mutations
+        #
+        # @return [undefined]
+        #
+        # @api private
+        #
+        # FIXME: There are MANY more mutations here :P
+        #
+        def dispatch
+          emit_explicit_receiver
+        end
+      end
+    end
+  end
+end
diff --git a/lib/mutant/mutator/registry.rb b/lib/mutant/mutator/registry.rb
new file mode 100644
index 00000000..87411f68
--- /dev/null
+++ b/lib/mutant/mutator/registry.rb
@@ -0,0 +1,48 @@
+module Mutant
+  class Mutator
+    # Registry for mutators
+    module Registry
+      # Return registry state
+      #
+      # @return [Hash]
+      #
+      # @api private
+      #
+      def self.registry
+        @registry ||= {}
+      end
+      private_class_method :registry
+
+      # Register mutator class for AST node class
+      #
+      # @param [Class] ast_class
+      # @param [Class] mutator_class
+      #
+      # @api private
+      #
+      # @return [self]
+      #
+      def self.register(ast_class,mutator_class)
+        registry[ast_class]=mutator_class
+        self
+      end
+
+      # Lookup mutator class for AST node class
+      #
+      # @param [Class] ast_class
+      #
+      # @return [Class]
+      #
+      # @raise [ArgumentError]
+      #   raises argument error when mutator class cannot be found
+      #
+      # @api private
+      #
+      def self.lookup(ast_class)
+        registry.fetch(ast_class) do
+          raise ArgumentError,"No mutator to handle: #{ast_class.inspect}"
+        end
+      end
+    end
+  end
+end
diff --git a/lib/mutant/mutator/send.rb b/lib/mutant/mutator/send.rb
deleted file mode 100644
index c3e027c6..00000000
--- a/lib/mutant/mutator/send.rb
+++ /dev/null
@@ -1,22 +0,0 @@
-module Mutant
-  class Mutator
-    # Mutator for Rubinius::AST::Send
-    class Send < Mutator
-
-      handle(Rubinius::AST::Send)
-
-    private
-
-      # Emit mutations
-      #
-      # @return [undefined]
-      #
-      # @api private
-      #
-      def dispatch
-        # Mutate "self.foo" into "foo"
-        emit_self(node.receiver,node.name,true,true)
-      end
-    end
-  end
-end
diff --git a/lib/mutant/mutator/send_with_arguments.rb b/lib/mutant/mutator/send_with_arguments.rb
deleted file mode 100644
index f3ebc850..00000000
--- a/lib/mutant/mutator/send_with_arguments.rb
+++ /dev/null
@@ -1,28 +0,0 @@
-module Mutant
-  class Mutator
-    # Mutator for Rubinius::AST::Send
-    class SendWithArguments < Mutator
-
-      handle(Rubinius::AST::SendWithArguments)
-
-    private
-
-      # Emit mutations
-      #
-      # @return [undefined]
-      #
-      # @api private
-      #
-      # FIXME: #   There are MANY more mutations here :P
-      #
-      def dispatch
-        # Mutate "foo(1)" into "self.foo(1)"
-        emit_self(node.receiver,node.name,arguments,true)
-      end
-
-      def arguments
-        new(Rubinius::AST::ArrayLiteral,node.arguments.array)
-      end
-    end
-  end
-end
diff --git a/spec/shared/mutation_enumeration_method_behavior.rb b/spec/shared/mutation_enumeration_method_behavior.rb
new file mode 100644
index 00000000..e8bf78d0
--- /dev/null
+++ b/spec/shared/mutation_enumeration_method_behavior.rb
@@ -0,0 +1,37 @@
+shared_examples_for 'a mutation enumerator method' do
+  subject { object.each(node) { |item| yields << item } }
+
+  let(:yields)        { []              }
+  let(:object)        { described_class }
+  let(:node)          { source.to_ast   }
+
+  it_should_behave_like 'a command method'
+
+  context 'with no block' do
+    subject { object.each(node) }
+
+    it { should be_instance_of(to_enum.class) }
+
+    let(:expected_mutations)  do
+      mutations.map do |mutation|
+        if mutation.respond_to?(:to_ast)
+          mutation.to_ast.to_sexp
+        else
+          mutation
+        end
+      end.to_set
+    end
+
+    it 'generates the expected mutations' do
+      subject = self.subject.map(&:to_sexp).to_set
+
+      unless subject == expected_mutations
+        message = "Missing mutations: %s\nUnexpected mutations: %s" %
+         [expected_mutations - subject, subject - expected_mutations ].map(&:to_a).map(&:inspect)
+        fail message
+      end
+    end
+  end
+end
+
+
diff --git a/spec/unit/mutant/mutator/call/class_methods/each_spec.rb b/spec/unit/mutant/mutator/call/class_methods/each_spec.rb
new file mode 100644
index 00000000..66b260dc
--- /dev/null
+++ b/spec/unit/mutant/mutator/call/class_methods/each_spec.rb
@@ -0,0 +1,54 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Call,'.each' do
+  pending 'send' do
+    context 'to self' do
+
+      context 'implict' do
+        let(:source) { 'foo' }
+
+        let(:mutations) do
+          mutations = []
+        end
+
+        it_should_behave_like 'a mutation enumerator method'
+      end
+
+      context 'explict' do
+        let(:source) { 'self.foo' }
+
+        let(:mutations) do
+          mutations = []
+          mutations << 'foo' # without explict receiver (send privately)
+        end
+
+        it_should_behave_like 'a mutation enumerator method'
+      end
+    end
+  end
+
+  pending 'send with arguments' do
+    context 'to self' do
+      context 'implict' do
+        let(:source) { 'foo(1)' }
+
+        let(:mutations) do
+          mutations = []
+        end
+
+        it_should_behave_like 'a mutation enumerator method'
+      end
+
+      context 'explict' do
+        let(:source) { 'self.foo(1)' }
+
+        let(:mutations) do
+          mutations = []
+          mutations << 'foo(1)' # without explict receiver (send privately)
+        end
+
+        it_should_behave_like 'a mutation enumerator method'
+      end
+    end
+  end
+end
diff --git a/spec/unit/mutant/mutator/each_spec.rb b/spec/unit/mutant/mutator/each_spec.rb
index f1894f2f..9f2a99f0 100644
--- a/spec/unit/mutant/mutator/each_spec.rb
+++ b/spec/unit/mutant/mutator/each_spec.rb
@@ -1,74 +1,18 @@
-# This file is big. Once mutation interface does not change
-# anymore it will be split up in mutation specific stuff.
+# This file is the sandbox for new mutations.
+# Once finished mutation test will be moved to class specfic 
+# file.
 
 require 'spec_helper'
 
-shared_examples_for 'a mutation enumerator method' do
-  it_should_behave_like 'a command method'
-
-
-  context 'with no block' do
-    subject { object.each(node) }
-
-    it { should be_instance_of(to_enum.class) }
-
-    let(:expected_mutations)  do
-      mutations.map do |mutation|
-        if mutation.respond_to?(:to_ast)
-          mutation.to_ast.to_sexp
-        else
-          mutation
-        end
-      end.to_set
-    end
-
-    it 'generates the expected mutations' do
-      subject = self.subject.map(&:to_sexp).to_set
-
-      unless subject == expected_mutations
-        message = "Missing mutations: %s\nUnexpected mutations: %s" %
-         [expected_mutations - subject, subject - expected_mutations ].map(&:to_a).map(&:inspect)
-        fail message
-      end
-    end
-  end
-end
-
-
 describe Mutant::Mutator, '.each' do
-  subject { object.each(node) { |item| yields << item } }
+  let(:random_string) { 'bar' }
 
-  let(:yields)        { []              }
-  let(:object)        { described_class }
-  let(:node)          { source.to_ast   }
-  let(:random_string) { 'bar'           }
-
-  context 'true literal' do
-    let(:source) { 'true' }
+  pending 'interpolated string literal (DynamicString)' do
+    let(:source) { '"foo#{1}bar"' }
 
     let(:mutations) do
-      %w(nil false)
-    end
-
-    it_should_behave_like 'a mutation enumerator method'
-  end
-
-  context 'false literal' do
-    let(:source) { 'false' }
-
-    let(:mutations) do
-      %w(nil true)
-    end
-
-    it_should_behave_like 'a mutation enumerator method'
-  end
-
-  context 'symbol literal' do
-    let(:source) { ':foo' }
-
-
-    let(:mutations) do
-      %w(nil) << ":#{random_string}"
+      mutations = []
+      mutations << 'nil'
     end
 
     before do
@@ -78,212 +22,7 @@ describe Mutant::Mutator, '.each' do
     it_should_behave_like 'a mutation enumerator method'
   end
 
-  context 'string literal' do
-    let(:source) { '"foo"' }
-
-    let(:mutations) do
-      %W(nil "#{random_string}")
-    end
-
-    before do
-      Mutant::Random.stub(:hex_string => random_string)
-    end
-
-    it_should_behave_like 'a mutation enumerator method'
-  end
-
- #context 'interpolated string literal (DynamicString)' do
- #  let(:source) { '"foo#{1}bar"' }
-
- #  let(:mutations) do
- #    mutations = []
- #    mutations << 'nil'
- #  end
-
- #  before do
- #    Mutant::Random.stub(:hex_string => random_string)
- #  end
-
- #  it_should_behave_like 'a mutation enumerator method'
- #end
-
-  context 'fixnum literal' do
-    let(:source) { '10' }
-
-    let(:random_integer) { 5 }
-    let(:mutations) do
-      %W(nil 0 1 #{random_integer}) << [:lit, -10]
-    end
-
-    before do
-      Mutant::Random.stub(:fixnum => random_integer)
-    end
-
-    it_should_behave_like 'a mutation enumerator method'
-  end
-
-  context 'float literal' do
-    let(:source) { '10.0' }
-
-    let(:mutations) do
-      mutations = []
-      mutations << 'nil'
-      mutations << '0.0'
-      mutations << '1.0'
-      mutations << random_float.to_s
-      mutations << '0.0/0.0'
-      mutations << '1.0/0.0'
-      mutations << [:negate, [:call, [:lit, 1.0], :/, [:arglist, [:lit, 0.0]]]]
-      mutations << [:lit, -10.0]
-    end
-  
-    let(:random_float) { 7.123 }
-
-    before do
-      Mutant::Random.stub(:float => random_float)
-    end
-
-    it_should_behave_like 'a mutation enumerator method'
-  end
-
-  context 'empty array literal' do
-    let(:source) { '[]' }
-
-    let(:mutations) do
-      mutations = []
-
-      # Literal replaced with nil
-      mutations << [:nil]
-
-      # Extra element
-      mutations << '[nil]'
-    end
-
-    it_should_behave_like 'a mutation enumerator method'
-  end
-
-
-  context 'array literal' do
-    let(:source) { '[true, false]' }
-
-    let(:mutations) do
-      mutations = []
-
-      # Literal replaced with nil
-      mutations << [:nil]
-    
-      # Mutation of each element in array
-      mutations << '[nil, false]'
-      mutations << '[false, false]'
-      mutations << '[true, nil]'
-      mutations << '[true, true]'
-
-      # Remove each element of array once
-      mutations << '[true]'
-      mutations << '[false]'
-
-      # Empty array
-      mutations << '[]'
-
-      # Extra element
-      mutations << '[true, false, nil]'
-    end
-  
-    it_should_behave_like 'a mutation enumerator method'
-  end
-
-  context 'hash literal' do
-    let(:source) { '{true => true, false => false}' }
-
-    let(:mutations) do
-      mutations = []
-
-      # Literal replaced with nil
-      mutations << [:nil]
-
-      # Mutation of each key and value in hash
-      mutations << [:hash, [:false ], [:true ], [:false], [:false]]
-      mutations << [:hash, [:nil   ], [:true ], [:false], [:false]]
-      mutations << [:hash, [:true  ], [:false], [:false], [:false]]
-      mutations << [:hash, [:true  ], [:nil  ], [:false], [:false]]
-      mutations << [:hash, [:true  ], [:true ], [:true ], [:false]]
-      mutations << [:hash, [:true  ], [:true ], [:nil  ], [:false]]
-      mutations << [:hash, [:true  ], [:true ], [:false], [:true ]]
-      mutations << [:hash, [:true  ], [:true ], [:false], [:nil  ]]
-
-      # Remove each key once
-      mutations << [:hash, [:true  ], [:true ]]
-      mutations << [:hash, [:false ], [:false ]]
-
-      # Empty hash
-      mutations << [:hash]
-
-      # Extra element
-      mutations << [:hash, [:true  ], [:true ], [:false], [:false ], [:nil], [:nil] ]
-    end
-
-    it_should_behave_like 'a mutation enumerator method'
-  end
-
-  context 'range literal' do
-    let(:source) { '1..100' }
-
-    let(:mutations) do
-      mutations = []
-      mutations << 'nil'
-      mutations << '1...100'
-      mutations << '(0.0/0.0)..100'
-      mutations << [:dot2, [:negate, [:call, [:lit, 1.0], :/, [:arglist, [:lit, 0.0]]]], [:lit, 100]]
-      mutations << '1..(1.0/0.0)'
-      mutations << '1..(0.0/0.0)'
-    end
-
-    it_should_behave_like 'a mutation enumerator method'
-  end
-
-  context 'exclusive range literal' do
-    let(:source) { '1...100' }
-
-    let(:mutations) do
-      mutations = []
-      mutations << 'nil'
-      mutations << '1..100'
-      mutations << '(0.0/0.0)...100'
-      mutations << [:dot3, [:negate, [:call, [:lit, 1.0], :/, [:arglist, [:lit, 0.0]]]], [:lit, 100]]
-      mutations << '1...(1.0/0.0)'
-      mutations << '1...(0.0/0.0)'
-    end
-
-    it_should_behave_like 'a mutation enumerator method'
-  end
-
-  context 'regexp literal' do
-    let(:source) { '/foo/' }
-
-    let(:base_mutations) do
-      mutations = []
-      mutations << 'nil'
-      mutations << "/#{random_string}/"
-    end
-
-    before do
-      Mutant::Random.stub(:hex_string => random_string)
-    end
-
-    let(:mutations) { base_mutations }
-
-    it_should_behave_like 'a mutation enumerator method'
-
-   #it 'when source is empty regexp' do
-   #  let(:source) { '//' }
-
-   #  let(:mutations) { base_mutations - [source.to_ast] }
-
-   #  it_should_behave_like 'a mutation enumerator method'
-   #end
-  end
-
-  context 'block literal' do
+  pending 'block literal' do
     # Two send operations
     let(:source) { "self.foo\nself.bar" }
 
@@ -301,66 +40,4 @@ describe Mutant::Mutator, '.each' do
 
     it_should_behave_like 'a mutation enumerator method'
   end
-
-
-  context 'self' do
-    let(:source) { 'self' }
-
-    let(:mutations) do
-      mutations = []
-    end
-
-    it_should_behave_like 'a mutation enumerator method'
-  end
-
-  context 'send' do
-    context 'to self' do
-
-      context 'implict' do
-        let(:source) { 'foo' }
-
-        let(:mutations) do
-          mutations = []
-        end
-
-        it_should_behave_like 'a mutation enumerator method'
-      end
-
-      context 'explict' do
-        let(:source) { 'self.foo' }
-
-        let(:mutations) do
-          mutations = []
-          mutations << 'foo' # without explict receiver (send privately)
-        end
-
-        it_should_behave_like 'a mutation enumerator method'
-      end
-    end
-  end
-
-  context 'send with arguments' do
-    context 'to self' do
-      context 'implict' do
-        let(:source) { 'foo(1)' }
-
-        let(:mutations) do
-          mutations = []
-        end
-
-        it_should_behave_like 'a mutation enumerator method'
-      end
-
-      context 'explict' do
-        let(:source) { 'self.foo(1)' }
-
-        let(:mutations) do
-          mutations = []
-          mutations << 'foo(1)' # without explict receiver (send privately)
-        end
-
-        it_should_behave_like 'a mutation enumerator method'
-      end
-    end
-  end
 end
diff --git a/spec/unit/mutant/mutator/literal/array/class_methods/each_spec.rb b/spec/unit/mutant/mutator/literal/array/class_methods/each_spec.rb
new file mode 100644
index 00000000..41f67949
--- /dev/null
+++ b/spec/unit/mutant/mutator/literal/array/class_methods/each_spec.rb
@@ -0,0 +1,32 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Literal::Array,'.each' do
+  context 'array literal' do
+    let(:source) { '[true, false]' }
+
+    let(:mutations) do
+      mutations = []
+
+      # Literal replaced with nil
+      mutations << [:nil]
+    
+      # Mutation of each element in array
+      mutations << '[nil, false]'
+      mutations << '[false, false]'
+      mutations << '[true, nil]'
+      mutations << '[true, true]'
+
+      # Remove each element of array once
+      mutations << '[true]'
+      mutations << '[false]'
+
+      # Empty array
+      mutations << '[]'
+
+      # Extra element
+      mutations << '[true, false, nil]'
+    end
+  
+    it_should_behave_like 'a mutation enumerator method'
+  end
+end
diff --git a/spec/unit/mutant/mutator/literal/boolean/class_methods/each_spec.rb b/spec/unit/mutant/mutator/literal/boolean/class_methods/each_spec.rb
new file mode 100644
index 00000000..1751bb71
--- /dev/null
+++ b/spec/unit/mutant/mutator/literal/boolean/class_methods/each_spec.rb
@@ -0,0 +1,23 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Literal::Boolean,'.each' do
+  context 'true literal' do
+    let(:source) { 'true' }
+
+    let(:mutations) do
+      %w(nil false)
+    end
+
+    it_should_behave_like 'a mutation enumerator method'
+  end
+
+  context 'false literal' do
+    let(:source) { 'false' }
+
+    let(:mutations) do
+      %w(nil true)
+    end
+
+    it_should_behave_like 'a mutation enumerator method'
+  end
+end
diff --git a/spec/unit/mutant/mutator/literal/empty_array/class_methods/each_spec.rb b/spec/unit/mutant/mutator/literal/empty_array/class_methods/each_spec.rb
new file mode 100644
index 00000000..687358ea
--- /dev/null
+++ b/spec/unit/mutant/mutator/literal/empty_array/class_methods/each_spec.rb
@@ -0,0 +1,19 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Literal::EmptyArray,'.each' do
+  context 'empty array literal' do
+    let(:source) { '[]' }
+
+    let(:mutations) do
+      mutations = []
+
+      # Literal replaced with nil
+      mutations << [:nil]
+
+      # Extra element
+      mutations << '[nil]'
+    end
+
+    it_should_behave_like 'a mutation enumerator method'
+  end
+end
diff --git a/spec/unit/mutant/mutator/literal/fixnum/class_methods/each_spec.rb b/spec/unit/mutant/mutator/literal/fixnum/class_methods/each_spec.rb
new file mode 100644
index 00000000..049ba192
--- /dev/null
+++ b/spec/unit/mutant/mutator/literal/fixnum/class_methods/each_spec.rb
@@ -0,0 +1,19 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Literal::Fixnum,'.each' do
+  let(:random_fixnum) { 5 }
+
+  context 'fixnum literal' do
+    let(:source) { '10' }
+
+    let(:mutations) do
+      %W(nil 0 1 #{random_fixnum}) << [:lit, -10]
+    end
+
+    before do
+      Mutant::Random.stub(:fixnum => random_fixnum)
+    end
+
+    it_should_behave_like 'a mutation enumerator method'
+  end
+end
diff --git a/spec/unit/mutant/mutator/literal/float/class_methods/each_spec.rb b/spec/unit/mutant/mutator/literal/float/class_methods/each_spec.rb
new file mode 100644
index 00000000..de14143d
--- /dev/null
+++ b/spec/unit/mutant/mutator/literal/float/class_methods/each_spec.rb
@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Literal::Float, '.each' do
+  context 'float literal' do
+    let(:source) { '10.0' }
+
+    let(:mutations) do
+      mutations = []
+      mutations << 'nil'
+      mutations << '0.0'
+      mutations << '1.0'
+      mutations << random_float.to_s
+      mutations << '0.0/0.0'
+      mutations << '1.0/0.0'
+      mutations << [:negate, [:call, [:lit, 1.0], :/, [:arglist, [:lit, 0.0]]]]
+      mutations << [:lit, -10.0]
+    end
+  
+    let(:random_float) { 7.123 }
+
+    before do
+      Mutant::Random.stub(:float => random_float)
+    end
+
+    it_should_behave_like 'a mutation enumerator method'
+  end
+end
diff --git a/spec/unit/mutant/mutator/literal/hash/class_methods/each_spec.rb b/spec/unit/mutant/mutator/literal/hash/class_methods/each_spec.rb
new file mode 100644
index 00000000..7a24d413
--- /dev/null
+++ b/spec/unit/mutant/mutator/literal/hash/class_methods/each_spec.rb
@@ -0,0 +1,36 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Literal::Hash, '.each' do
+  context 'hash literal' do
+    let(:source) { '{true => true, false => false}' }
+
+    let(:mutations) do
+      mutations = []
+
+      # Literal replaced with nil
+      mutations << [:nil]
+
+      # Mutation of each key and value in hash
+      mutations << [:hash, [:false ], [:true ], [:false], [:false]]
+      mutations << [:hash, [:nil   ], [:true ], [:false], [:false]]
+      mutations << [:hash, [:true  ], [:false], [:false], [:false]]
+      mutations << [:hash, [:true  ], [:nil  ], [:false], [:false]]
+      mutations << [:hash, [:true  ], [:true ], [:true ], [:false]]
+      mutations << [:hash, [:true  ], [:true ], [:nil  ], [:false]]
+      mutations << [:hash, [:true  ], [:true ], [:false], [:true ]]
+      mutations << [:hash, [:true  ], [:true ], [:false], [:nil  ]]
+
+      # Remove each key once
+      mutations << [:hash, [:true  ], [:true ]]
+      mutations << [:hash, [:false ], [:false ]]
+
+      # Empty hash
+      mutations << [:hash]
+
+      # Extra element
+      mutations << [:hash, [:true  ], [:true ], [:false], [:false ], [:nil], [:nil] ]
+    end
+
+    it_should_behave_like 'a mutation enumerator method'
+  end
+end
diff --git a/spec/unit/mutant/mutator/literal/range/class_methods/each_spec.rb b/spec/unit/mutant/mutator/literal/range/class_methods/each_spec.rb
new file mode 100644
index 00000000..6fc04a56
--- /dev/null
+++ b/spec/unit/mutant/mutator/literal/range/class_methods/each_spec.rb
@@ -0,0 +1,35 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Literal::Range,'.each' do
+  context 'inclusive range literal' do
+    let(:source) { '1..100' }
+
+    let(:mutations) do
+      mutations = []
+      mutations << 'nil'
+      mutations << '1...100'
+      mutations << '(0.0/0.0)..100'
+      mutations << [:dot2, [:negate, [:call, [:lit, 1.0], :/, [:arglist, [:lit, 0.0]]]], [:lit, 100]]
+      mutations << '1..(1.0/0.0)'
+      mutations << '1..(0.0/0.0)'
+    end
+
+    it_should_behave_like 'a mutation enumerator method'
+  end
+
+  context 'exclusive range literal' do
+    let(:source) { '1...100' }
+
+    let(:mutations) do
+      mutations = []
+      mutations << 'nil'
+      mutations << '1..100'
+      mutations << '(0.0/0.0)...100'
+      mutations << [:dot3, [:negate, [:call, [:lit, 1.0], :/, [:arglist, [:lit, 0.0]]]], [:lit, 100]]
+      mutations << '1...(1.0/0.0)'
+      mutations << '1...(0.0/0.0)'
+    end
+
+    it_should_behave_like 'a mutation enumerator method'
+  end
+end
diff --git a/spec/unit/mutant/mutator/literal/regex/class_methods/each_spec.rb b/spec/unit/mutant/mutator/literal/regex/class_methods/each_spec.rb
new file mode 100644
index 00000000..8dda0cbb
--- /dev/null
+++ b/spec/unit/mutant/mutator/literal/regex/class_methods/each_spec.rb
@@ -0,0 +1,35 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Literal::Regex,'.each' do
+  let(:random_string) { 'bar' }
+
+  context 'regexp literal' do
+    let(:source) { '/foo/' }
+
+    let(:base_mutations) do
+      mutations = []
+      mutations << 'nil'
+      mutations << "/#{random_string}/"
+    end
+
+    before do
+      Mutant::Random.stub(:hex_string => random_string)
+    end
+
+    let(:mutations) { base_mutations }
+
+    it_should_behave_like 'a mutation enumerator method'
+
+    context 'when source is empty regexp' do
+      before do
+        pending
+      end
+
+      let(:source) { '//' }
+
+      let(:mutations) { base_mutations - [source.to_ast] }
+
+      it_should_behave_like 'a mutation enumerator method'
+    end
+  end
+end
diff --git a/spec/unit/mutant/mutator/literal/string/class_methods/each_spec.rb b/spec/unit/mutant/mutator/literal/string/class_methods/each_spec.rb
new file mode 100644
index 00000000..6881e8fe
--- /dev/null
+++ b/spec/unit/mutant/mutator/literal/string/class_methods/each_spec.rb
@@ -0,0 +1,19 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Literal::String,'.each' do
+  let(:random_string) { 'bar' }
+
+  context 'string literal' do
+    let(:source) { '"foo"' }
+
+    let(:mutations) do
+      %W(nil "#{random_string}")
+    end
+
+    before do
+      Mutant::Random.stub(:hex_string => random_string)
+    end
+
+    it_should_behave_like 'a mutation enumerator method'
+  end
+end
diff --git a/spec/unit/mutant/mutator/literal/symbol/class_methods/each_spec.rb b/spec/unit/mutant/mutator/literal/symbol/class_methods/each_spec.rb
new file mode 100644
index 00000000..c242a586
--- /dev/null
+++ b/spec/unit/mutant/mutator/literal/symbol/class_methods/each_spec.rb
@@ -0,0 +1,20 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Literal::Symbol,'.each' do
+  let(:random_string) { 'bar' }
+
+  context 'symbol literal' do
+    let(:source) { ':foo' }
+
+
+    let(:mutations) do
+      %w(nil) << ":#{random_string}"
+    end
+
+    before do
+      Mutant::Random.stub(:hex_string => random_string)
+    end
+
+    it_should_behave_like 'a mutation enumerator method'
+  end
+end
diff --git a/spec/unit/mutant/mutator/self/class_methods/each_spec.rb b/spec/unit/mutant/mutator/self/class_methods/each_spec.rb
new file mode 100644
index 00000000..e1b43bee
--- /dev/null
+++ b/spec/unit/mutant/mutator/self/class_methods/each_spec.rb
@@ -0,0 +1,11 @@
+require 'spec_helper'
+
+describe Mutant::Mutator::Self,'.each' do
+  let(:source) { 'self' }
+
+  let(:mutations) do
+    mutations = []
+  end
+
+  it_should_behave_like 'a mutation enumerator method'
+end